BREAKING NEWS: Injured Federer withdraws in Rome
Roger Federer has suffered a potentially significant leg injury just nine days out from the French Open and has withdrawn from the Internazionali d'Italia.
The world number three had been due to face Stefanos Tsitsipas in the quarter-final in Rome on Friday.
A statement on the tournament's website said: "Roger Federer has just phoned the ATP supervisor and tournament director to announce his retirement due to a problem with his right leg."
Federer, whose only French Open title came a decade ago, had been hoping to build up some momentum on clay courts ahead of his first appearance at Roland Garros since 2015.